Rational Design of Complex Borides – One‐Electron‐Step Evolution from Soft to Semi‐Hard Itinerant Ferromagnets in the New Boride Series Ti2FeRu5–nRhnB2 (1 ≤ n ≤ 5)

The new Ti2FeRu5–nRhnB2 series (n = 1–5) was synthesized by arc melting of stoichiometric amounts of the elements. These phases were characterized by X‐ray diffraction methods as well as EDX measurements. All phases in the series are isostructural and crystallize with the Ti3Co5B2 type structure (space group P4/mbm, no. 127). Magnetic susceptibility measurements reveal that all phases order ferromagnetically below Curie temperatures found between 220 and 390 K. Furthermore, a strong dependence of the coercive field as a function of VEC (valence electron count) is observed in the series: An evolution from soft (in the Rh‐richer and VE‐richer region) to semi‐hard (in the Ru‐richer and VE‐poorer region) magnetic materials is found.